Question

Please help me the last two sums fast

Answer 1

Step-by-step explanation:

( x + y ) ² = x² + y² + 2xy

64 = x² + y² + 2 × 15 / 4

64 - 15 / 2 = x² + y ²

113/ 2 = x²+ y²

3 × 113 /2 = 3 ( x² + y ²)

339 / 3 = 3 ( x² + y² )

In the same way you find x - y

( x - y )² = x² + y² - 2xy

x- y = underroot ( x² + y² - 2xy )

substitute the values u get the answer

Hope you get it